Yeah, ok. So say you use a tower shield (the best shield for Sheltron). Assume it has a 15% block rate and a 30% block strength. On average your Sheltron increases mitigation by 26% so it's still an excellent skill.

Not trying to say there's no problem. WAR being just as good at physical, better at magic, and more DPS/utility than PLD is not balance no matter how Yoshida tries to cut it.